Answer:
b. Data analysis methods should usually be specified in advance before a study begins.
Step-by-step explanation:
Data analysis is the process of gathering or collecting, inspecting and evaluating data. The first process in data analysis is the collection of data. Analysis cannot take place if there is no data. Also, data analysis can take place at all phases of a research or study - beginning, during and at the end.
The main purpose of data analysis is to get reasonable and useful information and come up with logical business decisions and as such should be typically done in advance before a study begins.